本指南介绍如何使用 LangChain 中的嵌入模型。

如果你在 Colab 中打开这个 Notebook，可能需要先安装 LlamaIndex 🦙。

%pip install llama-index-embeddings-langchain

!pip install llama-index

from langchain.embeddings import HuggingFaceEmbeddings
from llama_index.embeddings.langchain import LangchainEmbedding

lc_embed_model = HuggingFaceEmbeddings(
    model_name="sentence-transformers/all-mpnet-base-v2"
)
embed_model = LangchainEmbedding(lc_embed_model)

# Basic embedding example
embeddings = embed_model.get_text_embedding(
    "It is raining cats and dogs here!"
)
print(len(embeddings), embeddings[:10])

768 [-0.005906202830374241, 0.04911914840340614, -0.04757878929376602, -0.04320324584841728, 0.02837090566754341, -0.017371710389852524, -0.04422023147344589, -0.019035547971725464, 0.04941621795296669, -0.03839121758937836]